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!Homebrew common mode choke

October 2023 · 1 minute read



So this is basically a 140-43 toroid with 9 turns of RG174 connected to
BNC connectors.

It works very well and I have made two measurements:

{{< figure src="logmag_through.png" caption="The maximum loss is on 10m around 0.2dB" >}}

{{< figure src="logmag_outer.png" caption="It attenuates common mode current with more than 20dB" >}}

Another picture with open case:

{{< figure src="choke-inside.jpg" caption="A look inside the \"plastic\"" >}}


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